Thanks. Yes they have isolated it from system. They have a large gauge on both one radiator and the boiler itself. The boiler/ heating was cold over night so no temperature drop.
I think this is whats happened. Instead of just replacing the leaking left flow unit they also replaced lots of other things too but needed to touch both isolation valves to take boiler apart. This has then resulted in them leaking ever since, which they've never spotted. I've picked the leaks up by doing my own isolation tests (3 times!).
They only wanted to run the isolation test for 3 hours yesterday. I asked them to come back today (at first they didn't want to come back until Monday but too cold to be without heating or hot water that long). So now the isolation test has ran for 26 hours.
I think its the left and right isolation valves leaking. Should I ask them to use thread seal on the valves? Would this help, as even the new valve looks to be leaking.
I think this is whats happened. Instead of just replacing the leaking left flow unit they also replaced lots of other things too but needed to touch both isolation valves to take boiler apart. This has then resulted in them leaking ever since, which they've never spotted. I've picked the leaks up by doing my own isolation tests (3 times!).
They only wanted to run the isolation test for 3 hours yesterday. I asked them to come back today (at first they didn't want to come back until Monday but too cold to be without heating or hot water that long). So now the isolation test has ran for 26 hours.
I think its the left and right isolation valves leaking. Should I ask them to use thread seal on the valves? Would this help, as even the new valve looks to be leaking.